Sport boot



FIG. 1 is a left side elevation view of sport boot showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a perspective view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for the sport boot, as shown and described. 